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Evaluation of integration methods for hybrid simulation of complex structural systems through collapse

Earthquake Engineering and Engineering Vibration 2017年第4期16卷 745-759页

作者： Maikol Del Carpio R. M.Javad Hashemi Gilberto Mosqueda KPFF Consulting Engineers Los AngelesCA 90045USA Faculty of Science Engineering and TechnologySwinburne University of TechnologyMelbourneVIC 3122Australia Department of Structural Engineering University of CaliforniaSan DiegoCA 92093USA

This study examines the performance of integration methods for hybrid simulation of large and complex structural systems in the context of structural collapse due to seismic excitations. The target application is not necessarily for real-time testing, but rather for models that involve large-scale physical sub-structures and highly nonlinear numerical models. Four case studies are presented and discussed. In the first case study, the accuracy of integration schemes including two widely used methods, namely, modified version of the implicit Newmark with fixed-number of iteration （iterative） and the operator-splitting （non-iterative） is examined through pure numerical simulations. The second case study presents the results of 10 hybrid simulations repeated with the two aforementioned integration methods considering various time steps and fixed-number of iterations for the iterative integration method. The physical sub-structure in these tests consists of a single-degree-of-freedom （SDOF） cantilever column with replaceable steel coupons that provides repeatable highly- nonlinear behavior including fracture-type strength and stiffness degradations. In case study three, the implicit Newmark with fixed-number of iterations is applied for hybrid simulations of a 1：2 scale steel moment frame that includes a relatively complex nonlinear numerical substructure. Lastly, a more complex numerical substructure is considered by constructing a nonlinear computational model of a moment frame coupled to a hybrid model ofa 1：2 scale steel gravity frame. The last two case studies are conducted on the same porotype structure and the selection of time steps and fixed number of iterations are closely examined in pre-test simulations. The generated unbalance forces is used as an index to track the equilibrium error and predict the accuracy and stability of the simulations.

关键词： Hybrid simulation collapse integration methods unbalance forces stability and accuracy numerical errors

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Comparison of capability of time integration methods in capturing dynamic loading

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Earthquake Engineering and Engineering Vibration 2010年第3期9卷 409-423页

作者： Shuenn-Yih Chang Chi-Wei Hsu Department of Civil Engineering Taipei University of Technology

Numerical properties of the time integration method proposed by the first author of this paper in 2007 are the same as those of the constant average acceleration method （AAM） for linear elastic systems, except that the capability to capture dynamic loading was not explored. It was found that there were different quadrature equations to predict the next step displacement increment. A modified quadrature equation of this method was derived so that the equation to determine the next step displacement was numerically equivalent to the equation used in the constant AAM. It was verified that the original form of this method, in general, had a better capability to capture dynamic loadings than the constant AAM. This excellent property, in addition to computational efficiency, will help to make this method competitive with general secondorder accurate integration methods.

关键词： equations of motion quadrature equation constant average acceleration method integration methods

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本体集成方法和工具综述

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图书馆学情报学 2011年第5期

作者：于晓繁王效岳白如江

本体集成是消除本体异质、实现语义通信并达到最高层级的语义融合，最后达到知识重用和互操作的过程。对本体集成的4种主要方法和5种主要工具进行综述，并对它们进行比较分析。

关键词：本体集成集成方法集成工具 Ontology integration integration methods integration tools

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